Process analysis of water ring vacuum pump in vacuum transportation

The vacuum suction solid device is mainly composed of suction nozzle, conveying pipe, separator, gas pipeline, dust collector and vacuum pump.

Water ring vacuum pump is characterized by reliable operation, simple structure, convenient operation and low noise. Due to water as the medium, even if there is a small amount of dust in the air, it is mixed with water after entering the vacuum pump, and it is often discharged from the exhaust hole with water, so the wear of the pump is small. In addition, the outstanding feature is that its working characteristic curve is close to the process requirements of suction and delivery, which can ensure the smooth operation of suction and delivery.

When the vacuum degree changes in the range of 0 ~ 60%, the gas volume only changes between 695 ~ 616 M 8 / h, and the change rate is only 11.4%.

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Causes and repair of shaft damage of water ring vacuum pump

At present, the shaft and impeller of water ring vacuum pump are all in one-stage dynamic fit, and there is no 0-type sealing ring at the keyway. The liquid in the pump (especially when the corrosive liquid is used as liquid ring in chemical industry) will enter the shaft hole through the fit clearance and keyway, which will corrode the shaft hole of the shaft and impeller, and greatly reduce the fatigue strength. The increase of fit clearance after corrosion and wear (some of which are ground into elliptical shaft holes) not only affect the performance, but also aggravate the vibration and promote fatigue fracture.

The general water ring vacuum pump shaft has not been heat treated, so the fatigue strength is low. In order to prevent fracture, the pump shaft should at least be quenched and tempered, and nitriding treatment should be carried out where conditions permit.

In the design, it is necessary to avoid large section mutation. Fillet connections are applied instead of sharp corners at the transition. The surface finish should not be low, especially in the place where the shaft is easy to break. During the processing, the circumferential machining of the transition parts of different shaft diameters should ensure the quality, and the size and smoothness required by the drawings should be strictly followed. There should be no knife marks, scratches, bumps and other defects on the surface and transition of the pump shaft.

The fatigue damage of pump shaft is very harmful to production, which is a problem of great concern to users. The solution is: according to the size of radial force to check the fatigue strength of the pump shaft, when using corrosive gas and liquid ring, the corresponding corrosion-resistant materials should be used, the pump shaft must be quenched and tempered, and the quality must be guaranteed during processing.

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Water Ring Vacuum Pump manufacturers

SSR Roots Type Blowers

High vacuum system with throttling

The pressure range of sputtering and other plasma processes is higher than that of various high vacuum pumps. These pumps can be used in the range of 0.5 to 10 Pa by adding a throttle valve between the pump and the vacuum chamber. This kind of throttle valve with small flow conductivity allows the gas from the high pressure and strong vacuum chamber to flow into the pump, while keeping the pump inlet pressure below the maximum pump pressure or critical inlet pressure. The typical sputtering chamber with cathode diameter of 150 to 200 mm has a diameter of 500 mm and a height of 250 mm. The traditional pumping unit is equipped with a 6-inch diffusion pump, but there are also some similar low-temperature pump or turbine molecular pump. The maximum displacement of such a pump is 100 to 200 PA · L / s. The pump is larger and, although more expensive, it also removes gas faster.

The problem of residual gas in the sputtering system is much larger than that in the high vacuum evaporation system. On the one hand, the plasma desorption of impurities on the wall is increased; on the other hand, the conventional sputtering deposition rate is much lower than the typical evaporation rate. Even if the production rates of the two processes are in the same order of magnitude, the sputtering films are more likely to be exposed to the residual gas impurities than the films condensed by the evaporation source. Electron ion collision desorption is an effective way to release gas from the wall of vacuum chamber, which is even more effective than mild baking. In the plasma, the desorbed gases appear to exist in the atomic state, so they can easily react with the sputtered films.

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Main uses of water jet pump

① It is used in vacuum distillation, concentration, dehydration, decolorization, drying, crystallization, filtration, degassing, material transportation, tail gas and dust absorption in chemical and pharmaceutical industries.

② It is applied to spray condensing secondary steam. In some processes, a large amount of secondary steam will be produced and a small amount of non condensable gas needs to be discharged to maintain normal production. This kind of water jet pump is also called water jet condenser, which takes condensation as the main and exhaust as the auxiliary.

③ It is applied to vapor-liquid mass transfer and absorption. The liquid flowing out at high speed meets the ejected gas. The entrainment process of air flow by jet is also the process of vapor-liquid two-phase mixing. Due to the large contact surface between gas and liquid in water jet pump, high-speed jet has great speed, which greatly strengthens the speed of mass exchange in absorption and mass transfer, and accelerates chemical reaction or material transfer process. Therefore, water jet pump has the function of both reactor and pump. It is used as absorption and mass transfer equipment in many occasions

④ In many large chemical plants and chemical fertilizer plants, the steam or hot water with certain energy is often discharged, resulting in energy waste. Water jet pump is used to inject low-energy fluid with less jars of high-energy fluid, so as to increase the energy site of the fluid, and then used in the production process.

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Vacuum pump in oil refining and petrochemical production

Vacuum pump is a kind of conveying machinery that draws air from negative pressure and exhausts at atmospheric pressure. Its purpose is to create and maintain the vacuum required by the process system. The vacuum pumps commonly used in oil refining and petrochemical production include reciprocating vacuum pump, water ring vacuum pump and jet vacuum pump.

The structure and working principle of reciprocating vacuum pump are basically the same as that of reciprocating compressor. The pressure difference between inside and outside the cylinder is very small, but its compression ratio is very large (for example, for 95% vacuum degree, the compression ratio is about 20). Therefore, the suction and discharge valves of the reciprocating vacuum pump must be light and flexible, easy to open and close; the volume of the rest gaps must be very small. At the same time, in order to reduce the adverse effect of the residual gas in the clearance on the pumping rate of the vacuum pump, the inner wall of the two ends of the cylinder of the vacuum pump is often provided with a balance airway connecting the two sides of the piston.

At the end of exhaust, the balance port can make the clearance communicate with the other side of the piston for a short time, so that the residual gas in the clearance can flow to the other side of the piston through the balance airway, so as to reduce the pressure of the gas in the clearance, so as to improve the suction efficiency, that is, to increase the volume coefficient. The limit vacuum produced by reciprocating vacuum pump can reach about 2KPa (absolute pressure). The gas discharged by reciprocating vacuum pump should not contain liquid. If the gas contains a large amount of steam, the condensable gas must be removed (generally condensed) before entering the vacuum pump, that is, reciprocating vacuum pump belongs to dry vacuum pump.

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Pollution and treatment of rotary vane vacuum pump

In the use of rotary vane vacuum pump, particles and steam or liquid constitute a nuisance of pollution.

Due to the inherent self compensation clearance adjustment function of pump mechanism, it is not particularly sensitive to small mechanism damage. In most designs, the sliding bearing chosen is less sensitive to dust than the ball bearing. Once the dust particles are separated from the oil by gravity, sediment will be generated in the oil pool, which will not participate in the oil circulation until it is removed. For these dust particles, they can be filtered by oil filter, but it doesn't seem worth it. If the pollution is serious and the replacement of filter is too complicated, it is not as simple as changing oil. Before the dust particles enter the pump, it is better to stop them in the position that can be handled.

Therefore, dry filter and oil trap are the most effective. The method of protection chosen shall depend on the volume handled, the size of the dust particles and the allowable pressure drop. In the case of abrasive dust particles, the surface hardness of pump parts should be increased to extend the service life.

Exposure to low vapor pressure is not uncommon. These substances condense in the pump, and mix with the lubricating fluid, or dilute the lubricating liquid, or into paint like and colloidal deposits. There is nothing the gas calming method can do about it. The best way is to block the steam before it reaches the pump. But in many cases, it is not appropriate to do so, because the pump works in such a wide pressure range, it is difficult to design an effective trap, or the maintenance of the well is difficult due to certain pollutants. At this time, most of them adopt the method of regular oil change.

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Single nozzle oil diffusion pump

The structure and principle of the diffusion pump are evaporator at the bottom and the diffusion pump oil is stored in it. The upper part is the air inlet, the right side pipe is the air outlet, and the mechanical pump provides the pre vacuum at the air outlet during operation. When the oil is heated by the electric furnace, the generated oil vapor is transmitted along the

The flow tube is ejected downward through the umbrella nozzle. Because there is vacuum (10-2 ~ 10-3 Torr) provided by mechanical pump outside the nozzle, the oil steam flow can be ejected for a long distance and hooked into a jet moving towards the air outlet. When the jet finally touches the wall cooled by cooling water, it will be given a liquid rest and flow back to the evaporator for reuse.

Once the gas molecules entering the pump from the air inlet fall into the steam flow, they will obtain the downward movement and fly down. Because the jet has high speed (about 200m / s), high vapor density (several to dozens of Torr of vapor pressure), and the diffusion pump oil has high molecular weight (350-500), it can effectively take away gas molecules. Therefore, in the jet interface, gas molecules can not stay for a long time, and its concentration is very small. In other words, on both sides of the jet interface, the extracted gas has a large concentration difference. It is this concentration difference that causes the energy source of the extracted gas to continuously cross the interface, diffuse into the jet and be taken to the outlet. There, they are taken away by mechanical pumps.

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Dry Type Oilless Vacuum Pumps

Rotary Vane Vacuum Pump

Piston of reciprocating vacuum pump

Reciprocating vacuum pump open type (cylinder) piston diagram is used in a small, slide free compressor.

When the press is working, the vertical component of the force acting on the speed bar presses the piston to the surface of the gas a, and the maximum value of the vertical component n corresponds to the beginning of the press out. The lift unit pressure on the side of the piston is determined by.

For high-speed compressors, it is desirable to minimize the weight of the piston. In addition to the widely used piston made of aluminum alloy in compressor manufacturing, the light-weight cast iron piston diagram can also be used. The cut on the side of the piston can not only reduce its weight, but also reduce the friction work.

The piston of the direct-current compressor is required to pass through the gas and is equipped with a suction valve at the top. The spherical diaphragm in the piston separates the suction volume from the crankcase.

When assembling the compressor, it can ensure that the piston fits the cylinder correctly. However, when the compressor is working, the adjustment achieved will be damaged due to the following reasons: the heat of the piston is higher than that of the cylinder, and the cylinder shape of the piston is distorted due to the influence of the rigidity of the ribs; while the cylinder is suction on one side and press out on the other side, and the temperature of the wall is high at both ends In the middle part, it will deform and lose the correct shape; elastic deformation under the action of gas pressure and piston force. As a result, instead of the contact of the overall bearing surface, the piston only supports on the cylinder with a small area with a particularly high load. Therefore, when the piston with a large diameter has a large diameter, there are often serious friction and scratches on the working surface, especially when the gas body with dust not removed is compressed well.

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Water Ring Vacuum Pump manufacturers

SSR Roots Type Blowers

The relationship between vapor pressure and temperature in vacuum system

The relationship between vapor pressure and temperature in vacuum system

When an airtight vacuum system is exposed to air and then pumped, if it is not baked, the partial pressure analyzer will show the peak at the mass of 18 (H2O). This will continue for weeks and months.

The table of water vapor pressure as a function of temperature indicates that the vapor pressure doubles when the temperature is increased by 12 ℃ near the room temperature. Although there is no liquid water in the system after prolonged pumping, there may be a very similar pressure temperature relationship between the surface layer of adsorbed water and the vapor pressure in equilibrium above the adsorbed layer

Honig plotted the vapor pressure of the elements over a wide temperature range in logarithmic coordinates. In the discussion, it is particularly significant that the slope of the curve. At room temperature, it is typical that the temperature increases by 20 ℃ and the pressure changes by 10 times.

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Composition of main vacuum system

The vacuum system in the vacuum gas phase drying equipment includes two parts: the main vacuum system and the leakage pump system.

The main vacuum system consists of main pump (roots vacuum pump), front stage pump (rotary vane vacuum pump or slide valve vacuum pump), front stage condenser, intermediate condenser, exhaust separator, water vapor pressure gauge, pipeline, valve and other components, which are used to vacuum the vacuum tank in preparation stage, high vacuum stage and vacuum pump oil.

Although the kerosene in the vacuum chamber is basically discharged in the step-down phase, there is still residual kerosene in the insulating material. Therefore, in the high vacuum phase, the gas entering the main vacuum system still contains a certain amount of kerosene vapor, which will be condensed into liquid in the front condenser and the middle condenser, while the water vapor in the gas will be discharged by the front pump and condensed and collected in the exhaust condenser.

The two front stage pumps are also responsible for the task of emergency evacuation in case of gas turnover alarm of heat generator and vacuum tank. The emergency evacuation is carried out through the pipeline of valve 3 through the main condenser of the condensation system. The condenser is used to ensure the condensation of kerosene hot gas during evacuation. It is false to make kerosene vapor less enter the vacuum unit.

SSR Roots Type Blowers

Oil Diffusion Vacuum Pump

Dry Type Oilless Vacuum Pumps

Preheating of vacuum pump before starting

The vacuum pump for transporting hot petroleum products shall be preheated evenly before starting. Preheating can be accomplished by circulating hot oil through a pump, and the temperature of the pump shell shall not be 40 ℃ lower than the working temperature of petroleum products. The cracking feed pump, on average, should be preheated for about 8 hours.

If the vacuum pump is preheated unevenly, it will occur: (1) the deflection of the vacuum unit and the distortion of the shaft; (2) the cracks on the pump housing; (3) the rotating parts of the rotor are stuck.

During the circulation of hot oil, there should be no dead angle in the vacuum pump, especially in the lower part of the pump casing, where the cold oil products will gather; otherwise, the upper part of the pump casing will be hotter than the lower part. Hot petroleum products shall be free to circulate along the entire surface of the pump casing.

In fact, the measurement proves that when the temperature difference between the lower shell wall and the upper shell wall of the outer pump shell is 180 ℃, the distortion of the outer bearing relative to the pump center line is equal to 5mm; in this case, the distance between the bearing centers is equal to 2m.

In order to prevent the rotor from being stuck due to temperature expansion of parts in axial and radial directions, sufficient axial and radial clearance (axial clearance of 4-7mm) shall be reserved.

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Water Ring Vacuum Pump manufacturers

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Main use of water jet pump

① It is used in vacuum distillation, concentration, dehydration, decolorization, drying, crystallization, filtration, degassing, material transportation, tail gas and dust absorption etc.

② When it is applied to spray condensing secondary steam, a large amount of secondary steam will be produced in some processes, which needs to be condensed. At the same time, a small amount of non condensable gas also needs to be discharged to maintain normal production. This kind of water jet pump is called water jet condenser, which is mainly composed of condensation and exhaust.

③ In the aspect of vapor-liquid mass transfer and absorption, the liquid flowing out at high speed meets the gas being ejected, and the process of air entrained by the jet is also the process of vapor-liquid two-phase mixing. Because the water jet pump has a large contact surface between the gas and liquid phases, and the high-speed jet has a large speed, which greatly strengthens the speed of the mass exchange process in absorption and mass transfer, and accelerates the chemical reaction or mass transfer process. Therefore, water jet pump has the function of both reactor and pump. It is used as absorption and mass transfer equipment in many occasions

④ In many large chemical plants and chemical fertilizer plants, the steam or hot water with certain energy is often discharged, resulting in energy waste. Water jet pump is used to inject low-energy fluid with less jars of high-energy fluid, so as to increase the energy site of the fluid, and then used in the production process.

⑤ The high-energy fluid used in the fluid power transmission and water jet pump is used to inject the low-energy fluid participating in the reaction, so as to replace the power equipment for fluid transmission.

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Application of condenser in vacuum system

The main function of the condenser is to condense the steam part of the mixed gas above 100 ℃ from the vacuum tank into the liquid below 25 ℃ at one time, so the cooling capacity should be particularly strong, and the condensation effect should be particularly good. Generally, the condensation power shall be more than 3 / 4 of the rated power (i.e. evaporator power) of VPD equipment.

The structure of the condenser is a shell and tube heat exchanger. There are many baffles in the shell side of the air flow to ensure that the air flow can be fully condensed. The total water inlet and outlet pipes are divided into several branches in the condenser to form enough condensation area. Due to the large amount of cooling water, VPD equipment needs to have a special cooling water station or chiller to supply circulating cooling water.

The temperature of cooling water has a great influence on the performance of condenser. The lower the water temperature is, the stronger the water catching capacity is, and the lower the partial pressure of water vapor in the residual gas after condensation is. Generally, the maximum partial pressure of water vapor that the leakage pump can bear is about 3kpa, and the corresponding saturation temperature of water vapor is 24 ℃. That is to say, the temperature of the oil water gas mixture at the outlet of the condenser should not exceed 24 ℃, otherwise, too much water vapor will enter into the leakage pump, affecting its normal work; and the temperature of the cooling water needs to be lower, which is difficult to guarantee in many areas of China in summer. In recent years, in order to effectively enhance the condensation effect, the main condenser of existing VPD equipment is cooled by a water chiller, or a small condenser with cooling water provided by the water chiller is connected in series between the collection tank and the leakage pump to further reduce the partial pressure of water vapor and kerosene vapor in the residual gas.

The working pressure of the condensing system is also very important. It is obvious that if the total pressure in the condenser and the collecting tank is lower than the saturated vapor pressure of water at that time, the water vapor is impossible to condense at all and will be pumped out by the drain pump. In order to fully condense the water vapor, the condensing pressure must be higher than the saturated vapor pressure. However, the pressure of the condensing system should not be too high. Because the pressure of the condensing system is too high, the gas pressure in the vacuum tank is required to be higher. Otherwise, the mixed gas cannot flow into the condenser naturally under the effect of the pressure difference, and the high pressure in the vacuum tank will directly affect the outward diffusion of water vapor in the insulating material. In consideration of the above two factors and the presence of permanent gas components in the residual gas, the working pressure in the condenser is selected as 4.5kpa, which can not only ensure the sufficient condensation of water swallow gas, but also make the pressure in the vacuum tank as low as possible

In the VPD equipment, there is also an auxiliary condenser in the condensation system, which is specially used to receive the high-temperature kerosene vapor discharged in the later stage of the kerosene purification process in the distillation chamber. The structure of the auxiliary condenser is the same as that of the main condenser. The power of the condenser corresponds to the power of the distillation chamber, and the condensed kerosene liquid is also discharged to the collection tank.

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Dry Scroll Vacuum Pump

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Composition and parameters of vacuum suction system

Use the vacuum pump or fan as the power source to make the inside of the system vacuum. The material moves in the pipeline in the suspended state. The working gas and the material are separated by the separator. This is vacuum suction.

Compared with other material conveying methods, vacuum suction has the advantage of simple equipment. It occupies less area, reliable suction conveying, and simple operation. It can be conveyed from several places to one place. It can also be distributed from one place to several places. It can be continuous discharge and intermittent discharge; the whole system is in operation. Negative pressure. No dust. Good working conditions. In contrast, its shortcomings are high energy consumption and more serious wear at the elbow. Some equipment abroad solves this problem by lining the inner wall of the elbow with soft rubber.

Vacuum suction can be divided into high vacuum suction and low vacuum suction according to different vacuum levels and vacuum pumps. High vacuum suction generally uses jet pumps and water ring pumps as the power source. The vacuum of the system is high, generally 5×104~3×104Pa. The airflow is also the smallest. At present, the largest SZ-4 water ring vacuum pump in China has a theoretical air flow of only 660m³/h when the degree of vacuum is 60%. Low vacuum suction generally uses centrifugal fans and ventilators as the power source. The straightness of the system is low. Generally it is 9×104~8×104Pa, so the conveying distance is close. It is not more than 50m, but the air volume is large. Such as the frequently used 7-17-9 1/2 fan. The air volume can reach 1800m3/h.

Vacuum suction has been widely used at home and abroad. From the loading and unloading of large ships to metallurgy. The transportation of bulk materials in foundry factories and flour mills, breweries, dust collection, dust removal, ash treatment, etc. In short, as long as there are bulk materials transportation and transportation, this method can be used. . The data reported that the vacuum suction device has been produced in specialized manufacturers abroad, and the stereotyped components of the entire system have been standardized and serialized.

The vacuum suction system mainly includes silo, suction nozzle, seat separator, separation silo, dust collector, water ring pump and other components.

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Water Ring Vacuum Pump manufacturers

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Material selection principle of vacuum material in vacuum pump

① The vacuum pump has enough mechanical strength and rigidity to ensure that the shell can withstand the atmospheric pressure under the room temperature and baking temperature, and does not deform when heating and baking (especially for ultra-high vacuum system).

② Good air tightness. To maintain a good vacuum environment, the wall material should not have porous structure, cracks or other defects that cause leakage. There are lower permeability rate and outgassing rate.

③ The saturated vapor pressure at the operating and baking temperatures should be low enough (especially for ultra-high vacuum systems).

④ Good chemical stability. It is not easy to oxidize and corrode, and does not react with the working medium in the vacuum pump and the outgassing in the process.

⑤ Good thermal stability. Keep good vacuum and mechanical properties within the working temperature (high and low temperature) of the system.

⑥ Under the working vacuum degree and working temperature, the internal components of the vacuum vessel shall maintain good working performance to meet the requirements of the working process.

⑦ It has good ductility, machinability and weldability, and is easy to process into complex shell.

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diaphragm vacuum valve principle application range

Diaphragm vacuum valve uses the valve rod to press the rubber diaphragm directly on the valve seat. It is used to cut off or connect air flow. It is often installed between the pumped container and various low vacuum pumps. Its action principle is to rotate the handle to move the stem downward, press the rubber diaphragm directly on the valve seat, and cut off the air flow. Rotate the hand wheel in the opposite direction, and the valve rod moves upward to drive the rubber diaphragm away from the valve seat and connect the air flow.

The main body of the valve is made of aluminum alloy. Simple structure, light weight, small volume and good sealing performance. The diaphragm vacuum valve with NBR is used for the non corrosive gas on the low vacuum pipeline and the temperature of - 25 ~ 80 ℃. The diaphragm vacuum valve with fluororubber can be used for the high vacuum system with the temperature range of - 30 ~ 150 ℃

The existing series of diaphragm vacuum valves produced in China have nominal diameters of 10 mm, 25 mm, 40 mm and 50 mm respectively. Among them, GM type high vacuum diaphragm has five types: GM type, GMC type, gm-kf type, gm-d-h (I) and gm-d-h (II). The difference lies in the form of connecting flange of the valve.

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Dry Type Oilless Vacuum Pumps

Roots Vacuum Pump

What are the types of water ring vacuum pumps

What are the types of water ring vacuum pumps?

The water ring vacuum pump in use has single-stage, multi-stage and single-stage cascade ejector series connection water ring vacuum pump. The two-stage water ring vacuum pump has a higher limit vacuum than the single-stage water ring vacuum pump, and the curve of suction capacity is flat, which is suitable for the work situation where a larger suction capacity is still needed under a higher vacuum.

The two-stage water ring vacuum pump can also be used as a secondary booster pump for high vacuum pumps such as water vapor jet. The two-stage water ring vacuum pump is a two-stage impeller connected in series on the same shaft, and the main shaft is directly connected with the driving device. There are two modes of operation when the two-stage water ring vacuum pump is used for vacuumizing the condenser in the power station: under the starting condition of low vacuum, the absolute pressure of the condenser and other vacuum systems is 14665.2pa, which can be operated in one stage; under the normal operation condition of high vacuum, the absolute pressure of the condenser is 5999.4pa, which can be operated in two stages.

The serial vacuum pump used in the power station is to connect a ejector to the inlet of the water ring vacuum pump to improve the suction vacuum. The air is used as working medium, which is ejected from the nozzle at high speed. The ejected gas is drawn out, and then enters the water ring vacuum pump, where it continues to be compressed. Finally, the gas and water are discharged out of the tank.

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Water Ring Vacuum Pump manufacturers

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Notes on the use of reciprocating vacuum compressor

Notes on the use of reciprocating vacuum compressor

① Always pay attention to the change of gas pressure and temperature at all levels, whether the temperature of lubricating oil and bearing exceeds the allowable value, and the change of current and cooling water temperature.

② Switch the oil filter regularly, check and analyze the quality of lubricating oil frequently, and replace the oil if it does not meet the specified requirements.

③ Always keep the parts complete and in good condition, and keep the body clean and sanitary.

④ Carry out scheduled maintenance on time and implement the maintenance system carefully.

⑤ Check the efficiency of oil separator and cooler regularly. If the efficiency is reduced, check and repair it.

⑥ The standby compressor shall be kept in full swing. When it is out of service for a long time, it shall be driven once a half month and run for half an hour.

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reciprocating vacuum pump maintenance method

In the normal use of vacuum pump products, it is inevitable that there are some problems due to incorrect use methods or loss. At this time, we need to master some maintenance knowledge to ensure the normal operation of the product, so as to ensure the normal operation of the work.

1. The pump shaft is generally made of 45 steel, and the installation seal journal is subject to high-frequency quenching with a hardness of 45-50hrc. In the process of use, the pump shaft may be damaged by journal wear, keyway key rolling, bending and so on.

During the maintenance of reciprocating vacuum pump, if the seal journal is found to be slightly covered and worn, it can be carefully polished with fine emery cloth or west oilstone. When the wear is more than 0.15mm, it can be chrome plated and then ground to the specified size. For the bending and straightening, please refer to the repair of centrifugal pump shaft. In case of serious damage, it can not be repaired, and the shaft and rotor can be replaced.

2. Repair of the end cover of reciprocating vacuum pump: the end cover is made of high-quality cast iron, which is practical. Due to the displacement of the shaft, the end face of the rotor is not vertical and other reasons, the end cover may be scratched or worn. The flatness of the end cover plane is out of tolerance.

In the process of repair, for the inspection of the flatness of the end cover, put the knife edge ruler on the plane of the end cover, use a feeler gauge to insert between the knife edge ruler and the end cover, and use the maximum straightness to replace the flatness.

SSR Roots Type Blowers

Oil Diffusion Vacuum Pump

Dry Type Oilless Vacuum Pumps

high temperature hot oil pump structural characteristics

high temperature hot oil pump structural characteristics

The high-temperature hot oil pump adopts the self heating and heat dissipation structure, which changes the traditional water cooling structure, makes the structure simple, small volume, saves operation cost, good performance and reliable use. It is the second generation product developed on the basis of digesting and absorbing foreign oil pumps in China. The basic structure is single-stage single suction cantilever foot support structure. The inlet of the pump is axial suction and the outlet is vertical upward, It is installed on the base together with the motor.

The support of high temperature hot oil pump adopts the structure of double end ball bearing, the front end is lubricated by lubricating oil, the rear end is lubricated by lubricating grease, and there is a oil pipe in the middle to observe the sealing condition and recover the heat transfer oil at any time.

High temperature hot oil pump is composed of pump body, pump cover, internal and external rotors, pump shaft, shaft end combination seal and other parts. The main drive is composed of a set of meshed rotors. The shaft end seal adopts the combination seal of high temperature resistance and reflux type, and the water tank type cooling method is used to control the temperature of the shaft seal. The high temperature gear pump is a positive displacement pump, which transports the melt by the change of working volume caused by the meshing of the driving and driven gears. The working volume is composed of pump body, gear tooth slot and bearing with side plate function. Pump and motor use three claw type elastic coupling to form oil pump unit.

Water Ring Vacuum Pump

Water Ring Vacuum Pump manufacturers

industrial vacuum pumps,vacuum furnaces

Heat treatment industry of vacuum pump system

The so-called vacuum heat treatment is a heat treatment method that the workpiece is heated to the required temperature in 10-1 ~ 10-2Pa vacuum medium, and then cooled at different cooling rates in different medium. Vacuum heat treatment is called efficient, energy-saving and pollution-free clean heat treatment by the contemporary heat treatment industry.

The vacuum heat-treated parts have a series of advantages, such as no oxidation, no decarburization, degassing, degreasing, good surface quality, small deformation, high comprehensive mechanical properties, good reliability (good repeatability, stable life), etc.

Therefore, vacuum heat treatment has been widely valued and applied at home and abroad. The popularity of vacuum heat treatment is regarded as an important indicator to measure the level of heat treatment technology in a country. Vacuum heat treatment technology is a hot spot in the development of heat treatment technology in recent 40 years, and it is also an important field of advanced manufacturing technology.

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Multiple water ring vacuum pumps

The advantages of using multiple water ring vacuum pumps at the same time, take a look!

  If the customer chooses three water ring vacuum pumps, one is used, one is standby, and one is overhauled, respectively connected in parallel with the three main drainage pumps and controlled by gate valves. So what are the advantages of using multiple water ring vacuum pumps?
   1. The water ring vacuum pump has a simple structure, low processing and manufacturing requirements, no suction and exhaust valves, stable operation, and even air volume;

  2. The compression of the water ring vacuum pump is close to isothermal compression, the temperature change during compression is small, and there is no metal contact surface in the pump that rubs against each other, which is not easy to cause combustion and explosion accidents;

  3. The rotating parts and the fixed parts in the pump cavity are sealed by liquid, no need for lubrication, simple maintenance, easy operation, stable and reliable work;

4. From the use result, after using the water ring vacuum pump, the drainage efficiency of the main drainage pump is significantly improved, and the starting procedure is simplified, the labor intensity when starting the pump is reduced, and the pump body has no impact and little damage when the pump is started. ;

  5. After using the water ring vacuum pump, the inlet bottom valve of the suction pipe is eliminated, the suction water is unobstructed, and the drainage efficiency of the pump is improved;

  6. Since the direction of water injection in the water injection pipe is from bottom to top, when the water level rises to the pump body, it can ensure that there is no air in the suction pipe and the pump body, preventing the occurrence of cavitation, which is conducive to the daily maintenance of the main drainage pump.

SSR Roots Type Blowers

Rotary Vane Vacuum Pump

Vacuum Valves Classification

Precautions for shutdown of stainless steel vacuum pump

Today, Xiaobian introduced to you what should be paid attention to when the stainless steel vacuum pump is shut down. Let's get to know.

1. First, close the intake pipe valve and working fluid valve;

2. Stop the motor;

3. Close the valve in the mechanical seal flushing pipeline;

4. If the ambient temperature is lower than 0 ℃, discharge the liquid in the pump body, separator and all pipelines after shutdown;

5. If the stainless steel vacuum pump is filled with working fluid, it will cause difficulty in starting the stainless steel vacuum pump. Therefore, after the pump is stopped, it must be ensured that the liquid cannot enter the pump body and intake pipe from the exhaust pipe, working liquid supply pipe, etc. If the exhaust side is equipped with a gas water separator, more attention should be paid. If it is uncertain whether the pump is filled with working fluid in other installation conditions or in case of failure, drain the working fluid in the pump before starting or ensure that the working fluid accounts for about 1 / 2-2 / 3 of the pump cavity.


Water Ring Vacuum Pump

Water Ring Vacuum Pump manufacturers

industrial vacuum pumps,vacuum furnaces

Coupling to reduce bearing deformation of Roots vacuum pump

The bearing of the Roots vacuum pump is the key to support the normal operation of the entire equipment. In order to avoid the failure caused by the deformation, countermeasures need to be taken.

1. Measure the bearing hole of the deformed Roots vacuum pump and measure the amount of deformation.

2. Process the Roots vacuum pump after fitting to the theoretical size.

3. After the upper and lower boxes processed in the unit are fastened, the actual bearing hole appears as a long axis equal to the theoretical hole diameter, and the horizontal hole diameter is slightly smaller than the theoretical hole diameter.


4. According to the deformation amount t of the long axis, remove the thickness of the upper and lower surfaces of the unit by the value of t.

5. Process the other bearing positions to the theoretical size.

6. After processing, the bolt hole of the bearing cover will be misaligned with the bolt hole of the box. The bearing cover can be reamed or the bearing hole of the box can be mapped and re-made.

The above measures reduce the deformation of the bearing of the Roots vacuum pump and improve the performance of the entire unit. I hope to help you.

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Structure characteristics of roots rotary vacuum unit

Roots vane vacuum unit can be used in various vacuum systems which need large pumping speed and low and high vacuum, which is closely related to its mechanism characteristics.

1、 An oil mist eliminator is installed inside the pump, which can effectively eliminate the oil mist in the gas discharged by the pump and avoid the pollution of the oil mist to the surrounding environment.

2、 The suction port of roots rotary vane vacuum unit is equipped with a check valve. When the pump stops, the check valve and the specially arranged hole in the pump can immediately isolate the pump from the pumped system, prevent the pump oil from returning to the pumped system, and maintain the vacuum degree of the pumped container at the same time. Therefore, this type of vacuum pump unit can not be equipped with a vacuum stop valve with air release It can reduce the user's use cost.

3、 The pump is equipped with an oil-gas separator, which, together with an oil mist eliminator, forms an effective noise elimination system, which can eliminate exhaust noise and avoid noise pollution.

4、 The pump and the motor are directly connected and installed, air-cooled and water-cooled pipes are not required, so this type of equipment is compact in structure and easy to install.

5、 The structure design of roots rotary vane vacuum unit is reasonable, the vibration is small, and it can work without anchor bolt.

The mechanism characteristics of roots rotary vane vacuum unit make it have the characteristics of high vacuum degree and wide range of pumping speed in use, which can greatly improve the working efficiency in many industries.

Vacuum Valves Classification

industrial vacuum pumps,vacuum furnaces

Dry Type Oilless Vacuum Pumps

Frequency control of circulating water pump

In the current use of the vacuum pump unit of the circulating water pump frequency control has a certain amount of research, and now the economic benefits of this unit is given certain, if you have any questions about the realization of the vacuum pump unit of the circulating water pump frequency control.

In the realization of water ring vacuum pump combined with engineering examples, the typical working condition time period method will be adopted to simplify the calculation of total energy consumption of pump operation. In this paper, the energy-saving characteristics of different parallel units and different operation control modes are analyzed. Based on the similarity law of water pump, the equal efficiency curve method to determine the efficiency of water pump at various operating points is given. The analysis results show that for the common control mode of water system, the relationship between the speed (flow) ratio of water pump and the power ratio of shaft is not tenable; for the water system with three pumps running in parallel, the efficiency of the rated operating point of water pump can be used to replace the efficiency of the typical operating point, so that the calculation is greatly simplified; for the air-conditioning water system, the frequency control device of water pump is adopted, its economy is certain, and The economy is closely related to the type of project, and the energy saving of VFD operation of circulating water pump in air conditioning system has been generally recognized in the industry.

For the realization of the frequency conversion and speed regulation of the circulating water pump of the vacuum pump unit, I hope it can help you, and in the later use, you can better understand the use principle and create higher profits for users.

Water Ring Vacuum Pump

Water Ring Vacuum Pump manufacturers

SSR Roots Type Blowers

Application preparation of vacuum pump unit

When using a pump can not meet the requirements of pumping and vacuum, several pumps need to be combined to complement each other to meet the process requirements. The combined vacuum pump is called vacuum pump unit. The vacuum pump unit can make the vacuum system obtain better vacuum degree and exhaust volume, and the vacuum pump unit with high adaptability can make the working condition application obtain high application efficiency. Therefore, we should select the vacuum pump unit correctly.

The application of vacuum pump unit needs to make corresponding preparations, such as the selection and assembly of vacuum pump unit.

The vacuum pump unit shall be selected and applied according to the medium conditions, environmental requirements and working condition specifications of the application project. When extracting the gas, it is necessary to know the composition of the gas and the composition of the extracted gas. The gas contains no condensable steam, whether there is particle dust, whether there is corrosiveness, etc. Select the appropriate pump for the extracted gas. If the gas contains steam, particles and corrosive gas, auxiliary equipment, such as condenser, dust remover, etc., shall be installed on the air inlet pipeline of vacuum pump unit.

When using the vacuum pump unit with oil seal vacuum pump, it is necessary to determine whether the vacuum system has requirements for oil pollution. If the equipment is strictly oil-free, all kinds of oil pumps should be selected, such as: water ring pump, low temperature pump, etc. In addition, the impact on environmental pollution should be considered. If the environment is not allowed to be polluted, the oil-free vacuum pump should be selected, or the oil vapor should be discharged to the outdoor. If the requirements are not strict, oil pump can be selected, and some anti oil pollution measures, such as adding cold well, oil trap, baffle, etc., can also meet the requirements of clean vacuum.

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Cleaning method of water ring vacuum pump

After using the water ring vacuum pump for a long time, it is inevitable that the pump body will be contaminated with some dust and other impurities. If these impurities enter into the pump, it will seriously affect the service performance of the water ring pump. Therefore, the user needs to clean the pump regularly. The water ring vacuum pump manufacturer introduces the following cleaning methods for us.

1. Clean the rolling bearing of water ring vacuum pump with gasoline, and wait for it to dry or blow dry after cleaning.

2. Clean the pump parts with anhydrous kerosene, and then wipe them with cotton cloth to ensure that there is no cotton fiber left on the parts.

3. Place diluted nitric acid or other soluble substances in the container and wait for about one hour, and then wash them with clear water directly. If there is pressure, the effect will be better.

The long-term use of water ring vacuum pump is inseparable from its regular cleaning and maintenance. Its cleaning operation includes not only external cleaning, but also internal cleaning. If the residual substances in the parts are not cleaned in time, they will mix into the newly changed lubricating oil, which will affect the oil quality and lubrication effect. Therefore, the user should pay attention to the cleaning operation of the pump.

SSR Roots Type Blowers

industrial vacuum pumps,vacuum furnaces

Dry Screw Vacuum Pump

The reason of noise of water ring vacuum pump and its solution

The reason of noise of water ring vacuum pump and its solution

Many users report that their own water ring vacuum pump often produces noise in the process of use, and the higher the pumping rate and vacuum degree of the pump, the greater the noise. The following content for you to introduce the cause of the water ring pump noise and specific solutions, you can refer to!

1. Large noise of the motor: if the noise of the water ring vacuum pump is caused by the large noise of the motor, the motor with low noise can be selected or the motor acoustic cover can be added.

2. Loud noise caused by installation: check whether the equipment foundation is installed firmly to avoid vibration; the motor shall be aligned with the pump coupling to avoid noise and vibration caused by insufficient connection accuracy.

3. Noise caused by vent of exhaust port: if noise is caused by this problem, muffler can be installed at the outlet.

4. The vacuum pump works under the limit vacuum: the limit vacuum of the water ring pump disc distribution board structure vacuum pump is 33hpa (absolute pressure), which will vibrate and increase the noise when it works at 50hpa generally. The limit vacuum of the water ring pump of the vertebral body distributor structure is 100hPa (absolute pressure), which will vibrate and increase the noise when it works at 110hpa generally. Therefore, we should correctly select the vacuum pump and avoid working at the extreme Vacuum limit.

5. Mechanical friction: we should often remove scale to avoid excessive noise caused by mechanical friction.

When the noise of the water ring vacuum pump is too loud in use, we should find out the cause of the noise in time, so that we can take targeted measures to solve the problem.

Water Ring Vacuum Pump

Water Ring Vacuum Pump manufacturers

Dry Type Oilless Vacuum Pumps

Introduction of heat dissipation mode of water ring vacuum pump

When the water ring vacuum pump draws vacuum in the fields of petroleum, chemical industry, medicine and so on, due to the high working pressure, it will produce certain heat. If the heat can't be dissipated in time, it will affect or even damage the internal parts of the pump for a long time. At this time, we will take an effective way to dissipate heat, which is determined according to the heat of different parts of the pump body Now, the water ring vacuum pump manufacturer will introduce it to us!

1. Add lubricating oil: since the working vacuum of water ring vacuum pump is not very high, generally, 46 mechanical oil can be used to replace the vacuum pump oil. Generally speaking, before start-up, the oil level in the oil window at both ends of the pump shall not be less than 2 / 3 of the height of the oil window, and shall not be less than 1 / 2 of the height during operation.

2. Use of the unit composed of the front-end pump: the main pump of the unit is water ring vacuum pump, and other mechanical vacuum pumps such as liquid ring vacuum pump, rotary vane vacuum pump and slide valve vacuum pump are the front-end pumps. The automatic operation, automatic overheating and overload protection of the unit are achieved through various vacuum instruments and control equipment. According to different process requirements and different configuration of the front stage pump, the pump can be composed of one or more pumps and the front stage pump.

Heat dissipation is conducive to slowing down the use pressure of the water ring vacuum pump, prolonging the service life of the pump and improving the working efficiency of the pump. Therefore, when using the water ring vacuum pump, we should choose the appropriate heat dissipation mode to ensure that the pump can be used for a long time.

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Vacuum pump drying in vacuum

Vacuum pump is widely used in the process of vacuum drying. The so-called vacuum drying is a kind of drying method that puts the material under negative pressure and reaches the boiling point under negative pressure through heating properly or makes the material solidify through melting point after cooling. Under the condition of negative pressure, the boiling point of the water in the material decreases with the increase of vacuum degree. At the same time, the water vapor content is reduced by the vacuum pump clearance, which makes the water and other solutions in the material obtain enough kinetic energy to separate from the material surface. In vacuum drying, some materials which are easy to oxidize and other chemical changes in the drying process can keep their original characteristics better because they are isolated from air under negative pressure, and the materials can also be better protected by vacuum pumping after injecting inert gas.

The process of vacuum drying is to place the dried materials in a closed drying chamber, vacuum the dried materials with a vacuum system and heat them continuously, so that the water inside the materials diffuses to the surface through the pressure difference or concentration difference, and the water molecules obtain enough kinetic energy on the surface of the materials. After overcoming the mutual attraction between the molecules, they escape to the low-pressure space of the vacuum chamber, so as to be true The process of pumping.

In the process of vacuum drying, the pressure in the drying chamber is always lower than the atmospheric pressure, the number of gas molecules is small, the density is low, and the oxygen content is low, so it can dry materials that are easy to oxidize and deteriorate, inflammable and explosive dangerous goods, etc. It can play a certain role in disinfection and sterilization of drugs, food and biological products, and can reduce the chance of material contamination or inhibit the growth of some bacteria.

Because the temperature of water is directly proportional to the vapor pressure in the process of vaporization, the water in the material can vaporize at low temperature during vacuum drying, which can realize low-temperature drying. This is beneficial to the drying of heat sensitive materials in some drugs, foods and agricultural by-products.

Dry Type Oilless Vacuum Pumps

EVP Helium Mass Spectrometer Leak Detector

industrial vacuum pumps,vacuum furnaces

The application of vacuum pump in CNC

The engraving machine is abbreviated as -CNC, which is used for high-precision processing of mobile phone touch screen glass, acrylic, and mobile phone shell aluminum parts. A vacuum is required to adsorb and fix the processed parts during the processing process.

The CNCs we are in contact with are divided into single-headed and double-headed. Currently, the market is dominated by double-headed CNCs. According to the different processing objects, the following will briefly introduce this.

In order to process touch screen glass (acrylic) CNC, such products require cutting fluid, because a large amount of cutting fluid cools the tool and the processed parts during the processing. The cutting fluid may be pumped to the vacuum pump. If the vacuum pump is lubricated with oil, the liquid will easily damage the vacuum equipment as soon as the liquid comes in contact with the oil, or the saturated gas for a long time will also cause emulsification of the vacuum pump oil and cause equipment damage; so now general users Both use water ring vacuum pumps.

Water Ring Vacuum Pump

Water Ring Vacuum Pump manufacturers

SSR Roots Type Blowers

Working principle of oil sealed vacuum pump

Working principle of oil sealed vacuum pump:

By changing the mechanical vacuum pump exhaust, maintenance and Realization of collective vacuum seal oil seal, pump cavity volume of moving parts. They work in the whole plant mechanical pump cavity volume, reduce the increase in emissions. When the pump chamber becomes the capacity of the working chamber, the pump inlet is connected to the air chamber and the largest until the re suction volume is far away from the pump suction chamber for the longest time. When the volume is reduced until the atmospheric pressure of the gas is higher than that of the compressed gas discharge valve, the discharge pressure of the gas is lower.


For oil seal pump fluid:

Large mechanical vacuum pumps, even the best design, and the relative motion between components are currently used, even with high precision. Vacuum pump limit, which is difficult to prevent low true air "break through" the end of the return inlet. In addition, due to the design, manufacture and inevitable harm of the pump, and reduce the assembly clearance limit vacuum. The components of relative movement between oil sealed vacuum pumps and the sealing of exhaust valves; the opportunity of harmful space filling to make it a "breakthrough" of high pressure gas is much less, more, better sealing performance, it can pump higher vacuum.

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Two requirements for selecting water ring vacuum pump

What should be paid attention to when selecting the imported water ring vacuum pump. The type of imported water ring vacuum pump is mainly determined by the air volume, vacuum degree or exhaust pressure required for operation. When the pump works, the following two aspects should be paid attention to:

1. As far as possible, it is required to operate in the high efficiency area, that is, in the area of critical vacuum degree or critical exhaust pressure.

2. Operation near the maximum vacuum or exhaust pressure shall be avoided. In this area, not only the efficiency is very low, but also the work is very unstable, easy to produce vibration and noise. For the imported vacuum pump with high vacuum degree, cavitation often occurs when it operates in this area. The obvious sign of this phenomenon is that there is noise and vibration in the pump. Cavitation will cause damage to pump body, impeller and other parts, so that the pump can not work.

According to the above principles, when the vacuum degree or gas pressure required by the pump is not high, it can be selected in the single-stage pump preferentially. If the vacuum degree or exhaust pressure is high, the single-stage pump is often unable to meet the requirements, or the pump is required to have a large amount of air under a high vacuum degree, that is, the performance curve is required to be relatively flat under a high vacuum degree, so the two-stage pump can be selected. If the vacuum degree is required to be more than - 710mmhg, water ring atmospheric pump or water ring roots vacuum unit can be selected as the vacuum pumping device.

If it is only used for imported vacuum pump, it is better to choose single acting pump. Because the structure of single acting pump is simple, easy to manufacture and maintain, and it has good cavitation resistance under high vacuum. If it is only used for compressor with larger air volume, it is suitable to select double acting pump. Because of the large air volume, small volume and light weight of the double acting pump, the radial force can be automatically balanced, the shaft is not easy to produce fatigue fracture, and the service life of the pump is long.

Water Ring Vacuum Pump

Water Ring Vacuum Pump manufacturers

Dry Type Oilless Vacuum Pumps

Selection of pumps for vacuum system

Considering what kind of vacuum pump is used in a vacuum system, first of all, according to the requirements of the system, second, we should have a detailed understanding of the performance characteristics of the pump, after comparing the advantages and disadvantages of various pumps, we can decide on it, so that we can choose the appropriate one.

1、 Oil seal mechanical pump

There are two-stage 2x Hokkaido rotary vane pump with a pumping speed of 0.5-150 L / s and a full range of products.

These pumps are used to obtain low vacuum, or as a high vacuum pump and pre pumping pump. With air ballast device, it can remove moist air. However, the limiting vacuum is one order of magnitude lower than that of dry air. The pumping speed of the pump refers to the pumping speed when the inlet pressure is 760 Torr. When the system pressure drops, the pumping speed also drops until it is close to the ultimate vacuum of the pump, and the pumping speed is also close to zero. The drawdown coefficient has certain regulations.


2、 Booster pump (roots pump)

The working pressure range is 10-5x10-4 Torr, the common range is 2-5x10-3 Torr, and the pumping speed range is 150-2000 L / s. there are a series of products in China. The maximum pumping speed of this kind of pump is between 2 ~ 10-2 Torr. It needs a front stage pump and can't exhaust directly to the atmosphere. The limiting vacuum varies with the preceding pump. Compared with the oil booster pump, it has a wider working pressure range, a higher maximum exhaust pressure (10-30 Torr for the mechanical booster pump, 1-2 Torr for the oil booster pump), and a small amount of reflux oil vapor, so it is more appropriate to use it to pump out condensable gases such as water vapor.

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Single screw pump

There are basically three types of screw pumps commonly used in the industry. They are divided according to the number of screws, namely, single screw pump, double screw pump and three screw pump. Then, let's see their characteristics and differences:

Single screw pump structure: the single head male screw rotor rotates eccentrically in the special double head female screw stator (the stator is soft), which can swing back and forth along the pump center line, and always keeps mesh with the stator.


Features of single screw pump:

1. It can transport liquid containing solid particles;

2. It can be used for almost any viscosity fluid, especially for high viscosity and non-Newtonian fluid;

3. The operating temperature is limited by the stator material.

Performance parameters: the flow rate can reach 150m3 / h, and the pressure can reach 20MPa.

Application of single screw pump: for molasses, pulp, starch paste, chocolate paste, paint, tar, paraffin, grease, mud, clay, clay, etc

industrial vacuum pumps,vacuum furnaces

Dry Screw Vacuum Pump

SSR Roots Type Blowers

Stainless steel magnetic pump

The magnetic pump is made of stainless steel with reasonable design and advanced technology. It has the characteristics of full sealing, no leakage and corrosion resistance. Static seal is used instead of dynamic seal in stainless steel magnetic pump, which makes the overflow parts of the pump in a completely sealed state.

The magnetic pump is made of corrosion-resistant and high-strength engineering plastics, jadeite ceramics and stainless steel. Therefore, it has good corrosion resistance and can prevent the transported medium from pollution.

The main materials and uses of magnetic pump the magnetic pump has compact structure, beautiful appearance, small volume, low noise, reliable operation, convenient use and maintenance. It can be widely used in chemical, pharmaceutical, petroleum, electroplating, food, national defense, scientific research institutions, metallurgy, dye and other units to pump acid, alkali, oil rare and precious liquid, venom, volatile liquid, as well as circulating water equipment supporting, filter supporting.

Water Ring Vacuum Pump

Rotary Vane Vacuum Pump

Dry Type Oilless Vacuum Pumps

Chemical pumps will help chemical production

A chemical pump is a machine that pressurizes and transports fluids. It changes the mechanical energy or other energy of the prime mover into liquid energy

In the chemical plant system, pumps are often used to transport, pressurize or return liquid materials such as raw materials, intermediate products and products. Therefore, pumps must have the characteristics of long-term, reliable, continuous and stable operation, high efficiency and low cost.

In the chemical industry, due to the different chemical production categories and process, the liquid delivered by the pump is very different. The corrosive range of these fluids ranges from non corrosive to strongly corrosive, such as hydrofluoric acid, concentrated alkali liquid, etc.; the viscosity range is from the liquid as thin as water to the high viscosity liquid of more than 100000 centipoises in the thick rubber industry, as well as the liquid containing suspended solids; there are non-toxic or highly toxic, highly volatile, flammable and explosive liquids; The temperature ranges from liquid hydrogen below the gas liquefying point of - 253 to thermal medium with a temperature of up to about 500, so there are many types of pumps.

Strictly speaking, chemical pump refers to the pump used to transport all kinds of liquid in the chemical process and the pump used to transport all kinds of chemical process liquid outside the process. In fact, the pumps used to transport industrial water and cooling water are not different from the pumps. Their main difference is that the chemical pumps often use special materials and designs to prevent corrosion and adapt to the characteristics of the chemical process.

Compared with water pumps, chemical pumps are much more complex in structure, shaft seal and pump materials. The technical difficulties and maintenance requirements of maintenance are much higher than those of ordinary pumps.

The normal operation of the pump is the key to ensure production. If the pump fails, it will affect production, or even cause half or full shutdown. Therefore, the maintenance and repair of the pump plays an extremely important role in the chemical production process.

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How to select horizontal centrifugal pump

Centrifugal pump is designed according to the principle of centrifugal force. The high-speed rotating impeller blades drive the water to rotate and throw out the water, so as to achieve the purpose of transportation. There are many kinds of centrifugal pumps, which can be divided into civil and industrial pumps from the use; from the transmission medium, they can be divided into clean water pump, impurity pump, corrosion-resistant pump, etc.

1、 The horizontal centrifugal pump with high efficiency, low noise and energy saving shall be selected, and it is strictly prohibited to choose out products.

2、 The motor voltage of horizontal centrifugal pump shall be the same, and the power supply system shall be the same as that of national grid.

3、 The pump shall be selected according to the design flow and the required head, and the pump output shall be reduced due to the abrasion of the pump. The pump can be selected by multiplying the calculated head h by the coefficient of 1.05-1.10. The characteristic curve shall be the pump whose head gradually decreases with the increase of the flow, so that the pump can work stably and reliably in parallel. The operation point of the pump shall be kept in the high-efficiency section for operation OK, it's energy-saving and not easy to damage the parts.

4、 When there is no regulating facility in the water supply network, it is better to use speed regulating pump group or rated speed pump group to run water supply. The maximum water output of the pump unit shall not be less than the design flow of water supply in the community, and shall be checked according to the fire fighting condition.

5、 The number of lifting pumps for water tank and water tower shall be minimized, one for use and one for standby; when a single pump can meet the requirements, multiple parallel connection mode shall not be adopted; if multiple parallel operation or matching mode of large and small pumps must be adopted, its model and number shall not be too many, and the model shall not be more than two generally, and the lift range of horizontal centrifugal pump shall be similar; each pump shall be in parallel operation The pump should still operate in the high efficiency area.

6、 The design water supply flow of the variable frequency speed regulating pump shall meet the requirements of the maximum design second flow in the domestic water supply system. The power supply shall be reliable; the working point of the water pump shall be selected in the efficient working area of the water pump characteristic curve, and shall not be selected on the extension line of the Q-H curve; the most unfavorable working point shall be designed at the right end of the efficient section of the water pump characteristic curve, that is, the point where the water output of the water pump is the largest and the lift is low, but it can meet the requirements, that is, the low point of the efficient section of the water pump characteristic curve and the pipeline characteristic curve The intersection of. The working range of water pump speed regulation shall be within the high efficiency section of water pump as far as possible; the speed regulation range shall be between 25% and 100% of water supply of water pump; the equipment shall have the function of automatic water level control.

7、 The water pump unit of the domestic pressurized water supply system shall be equipped with standby pump. The water supply capacity of the standby pump shall be greater than that of the largest operating water pump. The water pump shall be switched automatically and operated alternately

industrial vacuum pumps,vacuum furnaces

SSR Roots Type Blowers

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